マントル捕獲岩のハロゲン組成にみられるマントルメタソマティズムの影響

小林 真大; 角野 浩史; 長尾 敬介; Ray Burgess; 石丸 聡子; 荒井 章司; 芳川 雅子; 川本 竜彦; 熊谷 仁孝; 小林 哲夫; 中村 美千彦; 高橋 栄一

doi:10.14862/geochemproc.62.0_27

Abstracts of Annual Meeting of the Geochemical Society of Japan

Session ID : 1B11

DOI https://doi.org/10.14862/geochemproc.62.0_27

Conference information

Host: Abstracts of Annual Meeting of the Geochemical Society of Japan

Mantle metasomatism inferred from halogen systematics of mantle xenoliths

*Masahiro Kobayashi, Hirochika Sumino, Keisuke Nagao, Ray Burgess, Satoko Ishimaru, Shoji Arai, Masako Yoshikawa, Tatsuhiko Kawamoto, Yoshitaka Kumagai, Tetsuo Kobayashi, Michihiko Nakamura, Eiichi Takahashi

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Keywords: Halogen, Mantle xenolith, Subduction zone

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Abstract

Halogens are powerful tracers of subducted water. In order to investigate how far the influence of slab-derived fluids extends into the mantle, we studied halogens in mantle xenoliths. The halogens of the xenoliths from volcanic front were enriched in I and similar to those of sedimentary pore fluids. The similar signature was also found in some xenoliths from rear-arc region. The halogens of the xenolith from intraplate settings are explainable by a halogen fractionation from a MORB source-like composition.

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